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Originally Posted by Doriftomodachi
If you plan to stay with the ka with no cat but you want more power get the hotshot header. It gets rid of all cats (real and fake), flows smoothly and you will notice nice hp and torque gains.
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Not true, the HS header only removes the exhaust manifold and stock cat, not the hollow fake cat. You will need the test pipe mentioned above.
I went with the HS header, Random Technologies high flow cat, and the Apex N1 dual. I don't like the High flow-to-exhaust portion casue of the size differences. Eventually i'm gonna change exhausts to a Greddy for noise. Oh yeah and get new gaskets and mounting bolts taht way it will bolt up easily and clean.